TC Electronic DB4 MKII - Manual (Page 52)

Unwrap HD
48 DB4 / DB8 MKII Algorithms
Then choose between the Contour Styles, and
finally apply EQ to the center channel if desired.
Unwrap HD’s 48 bit EQ can work wonders on
most signals and be used to selectively sup-
press spectral ranges where the L/R width could
otherwise get compromised, or to boost select-
ed frequencies to strengthen the center anchor
function.
Surround page
To control the surround channels, decorrelation,
EQ and contour controls are provided.
First set the Ref. Level control at the approximate
reference level of the Input signal. For a typical
level, set Ref. Level at -10 to -18 dB. With a full
scale digital Input, Ref. Level would be set high,
typically 0 to -12 dB. With a quiet or highly dy-
namic Input, set it between -15 and -25 dB.
Then choose between the Contour Styles, and
select a Decorrelation style complementing your
program material.
The different decorrelation styles should always
be tried. They are highly subjective and best
evaluated with the
Focus control set at “0”. When a style is found,
try changing the Focus control to check if further
optimization is possible. It may prove convenient
to solo the surround channels while doing so.
Now adjust the Decorrelation Tone and EQ pa-
rameters.
Tuning of the surround parameters is an iterative
process and should include the Delay settings
as well.
Unwrap HD algorithm – main page
Unwrap HD algorithm – main page
Left/Right Input trim
Range: -100 to 0 dB
Input level trim parameters. You may use these
parameters to attenuate a too hot input signal.
L/R processing
Range: 0 to 100 %
This parameter controls the amount of left/right
content of the signal. E.g. if the Center channel
level has been increased the perceived stereo
image may seam considerably reduced col-
lapsed. Increase the L/R processing to compen-
sate. To find the best suitable setting you may
bypass the entire algorithm and compare while
focusing on the stereo image.
LFE Processing
LFE Hi Cut Frequency
Range: 10 to 200 Hz
Sets the Hi Cut frequency for the Output from the
LFE channel.
LFE Hi Cut Slope
Range: Off, 2nd, 4th
Sets how steep the LFE hi cut filter should op-
erate.